Cyclostoma

Cyclostoma is an obsolete genus name of operculate snails with circular aperture.

A picture published with the record for Cyclostoma. What it shows has not been checked.

Uncredited · Public Domain · via Wikipedia/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.

Time the record covers

At least 47 million years on record.

The record covers at least 48.07 Mya to 129 ka. No occurrence read is dated outside 56 Mya to 11.7 ka.

Paleocene — about 0 of 23 occurrencesEocene — about 20 of 23 occurrencesEoceneOligocene — about 0 of 23 occurrencesMiocene — about 2 of 23 occurrencesMiocenePliocene — about 0 of 23 occurrencesPleistocene — about 1 of 23 occurrences57–55 Mya — about 0.1 occurrences55–53 Mya — about 0.2 occurrences53–51 Mya — about 0.2 occurrences51–50 Mya — about 0.2 occurrences50–48 Mya — about 1.0 occurrences48–46 Mya — about 3 occurrences46–44 Mya — about 3 occurrences44–42 Mya — about 3 occurrences42–40 Mya — about 3 occurrences40–38 Mya — about 3 occurrences38–36 Mya — about 1 occurrence36–34 Mya — about 1.0 occurrences34–32 Mya — about 0.2 occurrences21–19 Mya — about 0.3 occurrences19–17 Mya — about 0.4 occurrences17–15 Mya — about 0.4 occurrences15–13 Mya — about 0.4 occurrences13–11 Mya — about 0.4 occurrences1.9–0 Mya — about 1 occurrence48.07 Mya129 ka57 Mya0 Mya

23 occurrences of Cyclostoma on record, most of them in the Eocene. The Paleobiology Database records this as a living group. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.

When

23 occurrences

These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.

Found in

2 formations

Bembridge Limestone — 50.68°N, 1.10°WBathurst — 33.48°S, 26.93°E

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The named rock units Cyclostoma has been recovered from, largest first. Drawn where the rock is now, not where it formed. 20 occurrences have no formation on record, which is common for older literature.

Cyclostoma and its relatives

Eocene

Where Cyclostoma and its relatives were recorded in the Eocene.

Found in the same rock

436 taxa

The Paleobiology Database records 16 sites for Cyclostoma, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.

This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.

Entered from

7 references

Each of the 23 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content2

Picture of Cyclostoma

Credit
nobody named on the record
Licence
Public Domain
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.

The description on this site

Licence
CC BY-SA 4.0

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Lamarck 1799